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KENNEDY, Martyn; SPENCER, Hamish G. Phylogenies of the Frigatebirds (Fregatidae) and Tropicbirds (Phaethonidae), two divergent groups of the traditional order Pelecaniformes, inferred from mitochondrial DNA sequences. Molecular Phylogenetics and Evolution. 2004-04-01, roč. 31, čís. 1, s. 31–38. Dostupné online [cit. 2023-01-09]. ISSN1055-7903. DOI10.1016/j.ympev.2003.07.007. (anglicky)
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KENNEDY, Martyn; SPENCER, Hamish G. Phylogenies of the Frigatebirds (Fregatidae) and Tropicbirds (Phaethonidae), two divergent groups of the traditional order Pelecaniformes, inferred from mitochondrial DNA sequences. Molecular Phylogenetics and Evolution. 2004-04-01, roč. 31, čís. 1, s. 31–38. Dostupné online [cit. 2023-01-09]. ISSN1055-7903. DOI10.1016/j.ympev.2003.07.007. (anglicky)